Hoisting-drum for elevators



2 Sheets-Sheet 1. P. L. WEIMEIL HOISTING DRUM FOR ELEVATORS.

Patented June 16, 1885.

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P. L. WEIMER. HOISTING DRUM FORELEVATORS. N0. 320,022. Patented June 16,1885.

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UNITED STATES PATENT OFFICE.

PETER L. WEIMER, or LEBANON, PENNSYLVANIA.

HOlSTlNG-DRUM FOR ELEVATORS.

YJEEC IFICATION forming part of Letters Patent No. 320,022, dated June16, 1885.

Application filed May 12, 1885, (No model.)

To all whom it may concern.-

Be it known that I, PETER L. WEIMER, a citizen of the United States,residing at Lebanon, in the county of Lebanon and State of Pennsylvania,have invented certain new and useful Improvements in Hoisting-Drums forElevators; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

In the operation of hoisting engines much difficulty has beenexperienced in endeavoring to provide frictional devices which willsecurely lock the drum and the shaft together and hold them against thepossibility of slip: ping or breaking away and allowing the load tofall, which often results in accidents attended with great loss ofproperty, and in inany instances resulting in personal injury, and notinfrequently in the loss of life.

My invention has for its object the construction of a hoisting mechanismhaving a positive and certain frictional action, so constructed andoperating with relation to the interior walls of the hoisting-drum andthe shaft upon which it revolves that its velocity or speed iscontrolled with ease and facility when lowering the elevator or load,and also enabling the operator to securely and rigidly lock the drum andthe shaft together when hoisting the elevator and its load, all of whichI accomplish by means of the combination of the devices, which willhereinafter more fully and at large appear.

In the accompanying drawings, which form a part of this specification,Figure 1 is a verticallongitudinal section of the hoisting-drum, itsmaster-wheel, and frictional mechanism. Fig. 2 is a vertical andtransverse section of the same at line 3/ y. Fig. 3is a sectional viewin perspective of the shaft.

Reference being had to the drawings, in which similar letters'refer tocorresponding parts, A represents the drum bolted to heads B O, whichare mounted upon a shaft, D,which is enlarged at E and provided with atransverse rectangular opening, F, having inwardly-projecting flanges GG, provided with recesses for the reception of projections on theadjacent boX carrying the brake-shoe. G G are bars bolted to the innersides of the rectangular opening aud extending the entire lengththereof, and are provided with recesses to receive the projections onthe box adjacent thereto. The flanges G G and the bars G G form a guidefor the sliding bar H, which is provided with recesses I, for thereception of the inner ends of links J, which are pivoted to the bar,their outer ends being pivoted in like manner in recesses L, formed inthe pro jections on the boxes K. The boxes K are provided withdovetailed cavities for the reception of wooden brakeshoes M, whichshould be so constructed that the end grain of the wood will bearagainst the inner smooth wall of the drum A, which has been bored out.The shaft D revolves in suitable bearings, N, and the heads B O of thedrum revolve upon the shaft D. The head 0 is provided with an annularflange, O, projecting outwardly toward the master-wheel P, which isrigidly secured to the shaft D. In the shaft is a longitudinalcylindrical opening, in which is inserted a rod, Q, which is attached tothe bar H by a screw on its inner end and a pin, V. The opening for thereception of the rod Q is enlarged or counter-bored at the outer end forthe reception of a sleeve screw-nut, S, which has at its inner end anoutwardly-proj ecting flange. Over the sleeve screw-nut are placedfrictionrings U,which rest against the shoulder formed by the projectingflange of the screw-nut, and are held in place bya screw-threadedfollower, R, within which follower revolves the cylindrical screw-nut S,which is held in the enlargement of the bore of the shaft by saidfollower. On the outer end of the cylindrical screw-nut S is secured ahand-wheel or crank, T, for revolving the nut S. The screw-nut isadapted to screw-threads on the outer end of the rod Q, so that by therevolving of the nut in one direction,by means of the hand wheel orcrank, the rod Q will be moved toward the head 0, thereby forcing thebrake-shoes against the inner wall of the drum A,th rough the medium ofthe bar H and links J. By turning the screw-nut S in the oppositedirection the rod Q will draw the bar H back, which, through the mediumof the bars J, will release the brake-shoes. It will be observed that avery slight movement of the bar H through the medium of the rod Q, thenut S, and the hand wheel or crank 'I will apply or release the ICObrakeshoes M, and that any movement of said brake-shoes is subject tothe will of the operator, who may apply the shoes with sufficient forceto lock the drum and the shaft securely together to provide for thewinding of the rope or cable to hoist the elevator. NVhen it is desiredto lower the elevator-car, the operator adjusts the pressure of thefrictional surfaces, so that steam may be cut off entirely from theengine, and the speed of the elevator-car in its descent is completelyunder his control and is effected entirely by gravity.

One of the important advantages of my improvement is that the frictionalsurfaces can be brought into contact under such pressure as tocompletely lock the drum and the shaft, so that the former cannotslip,'and that the same device which looked the drum and shaft, may beapplied so lightly as to regulate the speed of the descendingelevator-car.

In another application of even date of filing I have claimed thespecific construction of the means contained in the outer end of' theshaft for applying and releasing the frictional surfaces.

Having thus fully described my invention, what I claim is l. Thecombination of a hoisting-drum, a shaft provided with an enlargementwithin the drum, a friction-brake carried by the shaft Within theenlargement, and suitable means for applying the brake to the innerwalls of the drum, substantially as described.

2. The combination, with a hoisting-drum having a smooth inner wall, offriction-brake shoes supported by the shaft and extending nearlythroughout the entire length of the drum, and means, substantially asshown,

wvhcrebythe drum and the shaft can be securely locked together forhoisting, and the velocity of the revolving drum controlled forlowering.

3. The combination, of a hoistingdrum loosely mounted upon a shaftprovided with an enlargementjwithin the drum, a frictionbrake containedwithin the enlargement, a sliding bar, links connectedto the bar, andthe boxes containing the brake-shoes, and suitable means for applyingthe brake to the drum and releasing it therefrom, substantially asdescribed. v y

4. The combination, with a hoisting-drum revolving upon a shaft providedwith a rectangular opening within the drum and carrying afriction-brake, of means,substantiallyas shown, revolving with the shaftfor applyin and releasing the frictional surfaces.

5. The combination, with a hoistingdrum mounted upon a shaft having arectangular opening within the drum, a-friction-brake contained withinsaid opening, a sliding bar connected to the brake-shoes, and a rodpassing through one end of the shaft and adapted to engage and disengagethe frictional surfaces, substantially as described. I

6. The combination of the shaft having a rectangular opening providedwith the guides having recesses, the boxes having correspondingprojections, the sliding bar, thelinks connecting the boxes and the bar,and suitable means for expanding the boxes, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

PETER L. \VEIMER.

Vitnesses:

W. MORRIS WEIDMAN, JoHN A. WEIMER.

